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-rw-r--r--hints/README.hints6
1 files changed, 5 insertions, 1 deletions
diff --git a/hints/README.hints b/hints/README.hints
index 1d0f35cccd..9b49a398bc 100644
--- a/hints/README.hints
+++ b/hints/README.hints
@@ -297,7 +297,11 @@ be circumvented by the use of "call-back units". That is, the hints
file can tuck this information away into a file UU/cc.cbu. Then,
after Configure prompts the user for the C compiler, it will load in
and run the UU/cc.cbu "call-back" unit. See hints/solaris_2.sh for an
-example.
+example. Some callbacks exist for other variables than cc, such as for
+uselongdouble. At the present time, these callbacks are only called if the
+variable in question is defined; however, this may change, so the scheme in
+hints/solaris_2.sh of checking to see if uselongdouble is defined is a good
+idea.
=item Future status